What a load of absolute bollocks! So according to your little list deaf people shouldn't really be driving?
"you can hear the motorcycle or cyclist you just ran over"
Being able to hear them once you've ran over them is a little bloody late! Correct use of mirrors and proper observations, like you should be doing anyway can prevent harming anyone that isn't doing their very best to end up under your wheels themselves.
"the person behind you trying to get your attention because your car is leaking"
Proper maintenance prevents, and regular checks alert you to, those sort of things, that and on-board sensors.
"or has a flat tire"
If you can't tell if your car has a flat tyre then there is something wrong. very wrong. Then again its understandable if you can't feel a deflated tyre in those over-sized wallowing barges you call cars.
"or hear the train coming on the train crossing you are about to cross"
I'm not sure how it works in the States (where I presume you're from given your spelling of 'tyres') but most rail crossing in the UK have some form of physical barrier and/or warning sirens and lights, or sometimes gates, which one has to get out of a vehicle to open. If anyone is dumb enough to cross an open crossing, without turning down their music and making proper observations, then they probably deserve their eventual Darwin award.
"and it's important to hear the engine to make proper gear changes on manual cars"
I don't need to hear the engine to know when to change gears, neither does anybody I know given the preponderance of manual cars over here. If you need engine noise to know when to change gear then its probably best you stick to the auto-boxes you're so fond of that side of the pond.
"the engine tells you if something is wrong when it makes an unusual noise"
Again, proper maintenance and regular checks will prevent this and unless you're driving a properly old shit-box then your car will have a whole array of sensors and warning lights/display that will alert you to the fact that something is wrong long before you "hear" it.
"isolating the driver from the machine is a bad"
Again, in practice, with regards to being able to hear "road noise", what is the difference between having loud music or being deaf? According to you being deaf would similarly be a "very bad thing" when it comes to driving.
"it requires all your senses"
"you are not sitting on a sofa in your living room listening to your favorite music, sipping coffee and smoking a cigar like car manufacturers want you feel like when driving"
That may be how cars are advertised over there, not over here.
Your post sound more like a list of your inadequacies as an owner and driver of a "dangerous machine".